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-   -   Substitution problem that has me confused! (https://www.askmehelpdesk.com/showthread.php?t=56073)

  • Jan 20, 2007, 12:13 PM
    Adderb
    Substitution problem that has me confused!
    5s + 10t = 3
    2s + 1t = 0

    Any help is appreciated!:confused:
  • Jan 20, 2007, 12:29 PM
    Capuchin
    from your second equation, t = -2s

    put this into your first one and then solve for s. use your value for s to find t.

    let me know how you get on!
  • Jan 20, 2007, 12:36 PM
    Adderb
    Quote:

    Originally Posted by Adderb
    5s + 10t = 3
    2s + 1t = 0

    Any help is appreciated!:confused:

    I did the problem and came up with S= -1/5.. What did I do wrong?
  • Jan 20, 2007, 01:10 PM
    Capuchin
    Why can't s be -1/5?

    What do you get for t?
  • Jan 20, 2007, 01:13 PM
    Capuchin
    s = -1/5 looks right to me
    Now work out t.
  • Jan 20, 2007, 01:52 PM
    Adderb
    Quote:

    Originally Posted by Adderb
    5s + 10t = 3
    2s + 1t = 0

    Any help is appreciated!:confused:

    So if S= -1/5 and t =-2s, you have to still solve for the t
    I got t = 2/3
    Is this correct?
  • Jan 20, 2007, 01:56 PM
    cool_dude
    s = -1/5 is correct! If your book says a different answer than the book is incorrect. Answers books have mistakes in them at times and I talk from experience.
    Anyhow plugging in s = -1/5 into one of your equations should get you t = 2/5
  • Jan 20, 2007, 01:59 PM
    Capuchin
    I assume you typed 2/3 wrong, everything else you said is correct
  • Jan 20, 2007, 02:04 PM
    Adderb
    Quote:

    Originally Posted by Adderb
    5s + 10t = 3
    2s + 1t = 0

    Any help is appreciated!:confused:

    I did type that wrong... Thanks for all your help!
  • Jan 20, 2007, 02:26 PM
    Capuchin
    Don't mention it! ;)

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